The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
Preferred waters: Best in freestone streams
Time of day: Dusk
Habitat: Riffles
Diet: Mostly plankton; sometimes other aquatic insects
Current speed: Medium to Fast
Substrate: Boulders and gravel
Environmental tolerance: Quite tolerant of pollution and marginal temperature
Some Isonychia species are multibrooded, but not in the same way as most other multibrooded mayflies like the Baetidae. In those species, the flies emerging in midsummer or Fall are the offspring of the earlier hatch from the same year. In Isonychia, the Fall emergers are offspring from the previous Fall. They are present as half-grown nymphs when the first of their generation emerge. Although Isonychia broods have distinct peaks, some may be found on the water at any time in between.
Species in Isonychia |
|
|
---|---|---|
Isonychia bicolorMahogany Dun | 19 | 102 |
Isonychia campestrisSlate Drake | 0 | 0 |
Isonychia siccaSlate Drake | 0 | 0 |
Isonychia velmaSlate Drake | 0 | 0 |